Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO NONA.
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<
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xml:space
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">Patet ex iſta æquatione altitudinem jactus duplici titulo deficere ab alti-
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tudine columnæ prementis a, magis nempe deficit, cum celerius deprimitur,
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tardiuſve elevatur embolus tum etiam cum orificium E ratione canaliculi D
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amplitudine creſcit. </
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<
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<
s
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xml:space
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">amplitudo iſtius orificii æqualis amplitudini
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tubuli D atque pari celeritate embolus deprimatur eleveturque & </
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<
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xml:space
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x = {1/5} a, ſic ut ad quintam partem tantum aſſurgat vena effluens altitudinis a.</
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<
s
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xml:space
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">(ε) Diſpendium potentiæ abſolutæ jam hoc modo eruetur, poſito prius
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nullum laborem in elevandum embolum impendi. </
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<
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xml:space
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">Sit velocitas quâ embolus
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deprimitur = v, & </
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<
s
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xml:space
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">erit potentia abſoluta tempore unius agitationis integræ im-
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penſa = a v θ (per paragraphum tertium) quia vero effectus in eo conſi-
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ſtit, ut effluxus fiat per E durante tempore t ipſaque aqua ad altitudinem
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{mmθθ/mmθθ + μμ tt} X a elevetur, potuiſſet id antlia ſimplex figuræ quadrageſimæ
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quintæ efficere, ſi pro potentia premente in illa ſumtus fuiſſet cylindrus aqueus
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altitudinis {mmθθ/mmθθ + μμtt} X a, atque hæc potentia durante tempore t velocitate
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{θ/t} v egiſſet; </
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<
s
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xml:space
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">unde potentia abſoluta in hâc machina ſimplici, qua nihil de illa
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perditur, requiſita futura fuiſſet =
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{mmθθ/mmθθ + μμtt} X a X {θ/t} v X t = {mmθθ/mmθθ + μμtt} X a v θ.
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</
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<
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xml:space
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">Eſt igitur tota potentia abſoluta ad partem ejus inutiliter perditam ut a v θ ad
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a v θ - {mmθθ/mmθθ + μμtt} X a v θ ſeu ut mm θθ + μμtt ad μμtt. </
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<
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xml:space
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">Igitur ſi in-
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tegra potentia abſoluta deſignetur per P, erit ejus diſpendium = {μμtt/mmθθ + μμtt} X P.</
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<
s
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xml:space
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">Neceſſe igitur eſt in hâc præ aliis antliis, ut diabetes amplitudine ad-
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modum ſuperet orificium E, vel ut multiplex adſit. </
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<
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xml:space
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">Si enim unicus adeſſet,
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isque amplitudine orificio E æqualis, ſimulque uniformi velocitate ſurſum de-
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orſumque agitari ponatur embolus, diſpendium oriretur quatuor quintarum
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totius partium: </
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<
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">atque ſi vel duplo amplior fiat, etiamnum perdetur dimi-
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dium potentiæ abſolutæ.</
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<
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">(ς) Denique perſpicuum eſt minorem preſſionem ſuſtinere latera catini
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G E, quam modioli A A, quippe preſſiones iſtæ ſint ut x ad a, id eſt, </
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